Rectangular boxes are the ‘tall, slender ones’ among gift boxes: they can hold snowboards, bottles of wine and flutes, but as the length increases, the most common flaw is ‘sagging’—where the centre collapses and the ends curve upwards. This article explains the key considerations for designing rectangular boxes.
How to test them? Load long items (bending test), check the central support (it should not sag when supported by hand); Markings indicating the transport orientation (horizontal/vertical) must be printed on the box. For small-batch production of long boxes, produce a prototype before placing an order.
What ensures bending resistance? Bending resistance in long boxes (lateral support) is achieved by: thickening the side flaps (greyboard density) and adding a central partition (stiffener); the wall thickness of ‘slender boxes’ must be greater than that of standard boxes.
How is the aspect ratio determined? For long boxes (aspect ratio greater than 3:1): length (product + allowance), width (inner tray + cushioning); when the aspect ratio is too large (exceeding 5:1), ‘ribs’ must be added to the structure.
The design of long gift boxes involves striking a balance between ‘length for elegance and structure for strength’: a restrained aspect ratio, sufficient bending resistance and segmented inner lining — ensuring the long box does not sag at the centre, thereby enhancing its aesthetic appeal.
How should the opening mechanism be determined? Opening mechanisms for long boxes (flap lids, pull-out designs): Flap lids on long boxes (with long hinges) are prone to deformation — incorporate magnetic closures or snap fasteners (multi-point fixation); for pull-out (drawer-style) designs, allow for clearance in the guide rails.
How should the internal lining be configured? Internal lining for long boxes (compartments, slots): Long items (snowboards, tall bottles) should be secured in sections (top and bottom + centre); the density of the lining (EVA / thermoformed) should be selected according to the weight of the product.
